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2.6.2
Oil Traps
2.6.2.1
If the Indoor Unit Is Installed Higher than the Outdoor Unit:
If oil flows back into the outdoor unit's compressor, this might cause liquid
compression or deterioration of oil return. Oil traps in the rising gas piping can prevent
this.
An oil trap should be installed every 10m (32.Sft) of vertical suction line riser.
2.6.2.2
If the Outdoor Unit Is Installed Higher than the Indoor Unit:
It is recommended that vertical suction risers not be upsized. Proper oil return to the
compressor shouId be maintained with suction gas velocity. If velocities drop below 7.62m/s
(1500fpm (feet per minute)), oil return will be decreased.
An oil trap should be installed every 6m (20ft) of vertical suction line riser.
2.6.3
The Procedure of Connecting Pipes
2.6.3.1
Choose the Pipe Size according to the Specification Table.
2.6.3.2
Confirm the Cross Way of the Pipes.
2.6.3.3
Measure the Necessary Pipe Length.
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